该理论指出，在一个较长的时间段内，任何两国之间的汇率应该朝着某一方向移动，从而使得在两国购买等量的货物和服务的价格相等。
This says that, in the long run, exchange rates should move toward rates that would equalise the prices of an identical basket of goods and services in any two countries.
比如，这是在购买货物和服务的过程中最常见沟通方式。
For example, this is the most common form of communication in the process of purchasing goods and services.
现场购买是当他们需要时的采购货物和服务，通常是在当前的市场价格。
Spot buying is the purchase of goods and services as they are needed, usually at prevailing market prices.
现场购买是当他们需要时的采购货物和服务，通常是在当前的市场价格。
Spot buying is the purchase of goods and services as they are needed, usually at prevailing market prices.
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